noun The periodic mixing or circulation of water in a lake or sea as a result of changing temperature of its layers.

from The Century Dictionary.

To overset; upset; overthrow.

To subvert; ruin; destroy; bring to naught.

To overpower; conquer; overwhelm.

SynonymsOverturn, Overthrow, Subvert, Invert, upset, throw down, beat down, prostrate. The first three of the italicized words indicate violence and destructiveness. Invert is rarely used where the action is not careful and with a purpose: as, to invert a goblet to prevent its being filled. That which is overturned or overthrown is brought down from a standing or erect position to lie prostrate. Overthrow indicates more violence or energy than overturn, as throw is stronger than turn. That which is subverted is reached to the very bottom and goes to wreck in the turning: as, to subvert the very foundations of justice. To invert is primarily to turn upside down, but it may be used figuratively, of things not material, for turning wrong side before or reversing: as, to invert the order of a sentence. See defeat, v. t., and demolish.

To be overturned; capsize: as, a boat that is likely to overturn.

noun The state of being overturned or subverted; the act of overturning; overthrow.

noun Refrain; burden.

from the GNU version of the Collaborative International Dictionary of English.

transitive verb To turn or throw from a basis, foundation, or position; to overset.

transitive verb To subvert; to destroy; to overthrow.

transitive verb To overpower; to conquer.

noun The act off overturning, or the state of being overturned or subverted; overthrow.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

over- +‎ turn

Examples

(The dissent did not address this issue, as the dissenting justices would have granted relief on the Miranda claim.) Interestingly enough, because today’s decision was 5 – 4, if one ignores Berghuis v. Thompkins, the Sixth Circuit appears to be more of an outlier, as the combined vote to overturn is habeas decisions would be33 – 3.

I wouldn't be at all surprised to see Obama and the Democrats (sounds like a bad Afghani doo-wop band) push the healthcare issue to the supreme court in an attempt to "overturn" the laws of economics and supply and demand.

Bush rushed to judgment in 2000 based on incomplete results and the media immediately started treating him like the victor and Democratic efforts to count all the votes as efforts to "overturn" the election.

Rwanda's Lake Kivu is one of the world's three "exploding lakes" and is at serious risk of "overturn," a process whereby huge amounts of carbon dioxide are released from under its surface, suffocating everyone in the surrounding areas.